Gold-patched graphene nano-stripes for high-responsivity and ultrafast photodetection from the visible to infrared regime

Cakmakyapan, Semih; Lu, Ping Keng; Navabi, Aryan; Jarrahi, Mona

doi:10.1038/s41377-018-0020-2

Gold-patched graphene nano-stripes for high-responsivity and ultrafast photodetection from the visible to infrared regime

Journal Article · Wed Jun 20 00:00:00 EDT 2018 · Light, Science & Applications

DOI:https://doi.org/10.1038/s41377-018-0020-2· OSTI ID:1510255

Cakmakyapan, Semih ^[1]; Lu, Ping Keng ^[2]; Navabi, Aryan ^[2]; Jarrahi, Mona ^[2]

Univ. of California, Los Angeles, CA (United States). Electrical Engineering Dept.; Univ. of California, Los Angeles, CA (United States)
Univ. of California, Los Angeles, CA (United States). Electrical Engineering Dept.

Graphene is a very attractive material for broadband photodetection in hyperspectral imaging and sensing systems. However, its potential use has been hindered by tradeoffs between the responsivity, bandwidth, and operation speed of existing graphene photodetectors. Here, we present engineered photoconductive nanostructures based on gold-patched graphene nano-stripes, which enable simultaneous broadband and ultrafast photodetection with high responsivity. These nanostructures merge the advantages of broadband optical absorption, ultrafast photocarrier transport, and carrier multiplication within graphene nano-stripes with the ultrafast transport of photocarriers to gold patches before recombination. Through this approach, high-responsivity operation is realized without the use of bandwidth-limiting and speed-limiting quantum dots, defect states, or tunneling barriers. We demonstrate high-responsivity photodetection from the visible to infrared regime (0.6 A/W at 0.8 μm and 11.5 A/W at 20 μm), with operation speeds exceeding 50 GHz. Our results demonstrate improvement of the response times by more than seven orders of magnitude and an increase in bandwidths of one order of magnitude compared to those of higher-responsivity graphene photodetectors based on quantum dots and tunneling barriers.

View Accepted Manuscript (DOE)

Research Organization:: Univ. of California, Los Angeles (United States)

Sponsoring Organization:: USDOE Office of Science (SC)

Grant/Contract Number:: SC0016925

OSTI ID:: 1510255

Journal Information:: Light, Science & Applications, Journal Name: Light, Science & Applications Journal Issue: 1 Vol. 7; ISSN 2047-7538

Publisher:: Nature Publishing GroupCopyright Statement

Country of Publication:: United States

Language:: English

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